Yes - if they are added as a user under your license. You can then use the Teamwork function to work on the same prototype at the same time. https://www.justinmind.com/support/how-to-work-on-shared-prototypes-with-your-team/
My question is could I add them as a user through my license or do they need to but a license of their own to become a user?
You can add them as a user under your license. In your online account, you can go to Settings and add more users there.
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